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Minimal seesaw extension for neutrino mass and mixing, leptogenesis and dark matter: FIMPzillas through the right-handed neutrino portal

Minimal seesaw extension for neutrino mass and mixing, leptogenesis and dark matter: FIMPzillas through the right-handed neutrino portal
Minimal seesaw extension for neutrino mass and mixing, leptogenesis and dark matter: FIMPzillas through the right-handed neutrino portal
We propose a minimal seesaw extension to simultaneously account for realistic neutrino mass and mixing, the baryon asymmetry of the Universe via leptogenesis and a viable dark matter relic density, in which two right-handed neutrinos are coupled to a dark Dirac fermion and complex scalar field, both charged under a global U(1)D symmetry. As a concrete example, we consider the Littlest Seesaw model which describes neutrino mass and mixing and accounts for leptogenesis, thereby fixing the neutrino Yukawa couplings and right-handed neutrino masses. By considering the freeze-in production mechanism of dark matter, we explore the parameter space of right-handed neutrino portal couplings and dark particle masses which give the correct dark matter relic abundance, focussing on the case of a superheavy Dirac fermion dark matter particle, with a mass around 1010 GeV . Such a FIMPzilla can provide a successful explanation of the dark matter relic abundance, with its production reliant on neutrino Yukawa couplings over much of the parameter space, depending on the assumed dark particle masses, and the reheat temperature.
1475-7516
1-23
King, Stephen
f8c616b7-0336-4046-a943-700af83a1538
King, Stephen
f8c616b7-0336-4046-a943-700af83a1538

King, Stephen (2020) Minimal seesaw extension for neutrino mass and mixing, leptogenesis and dark matter: FIMPzillas through the right-handed neutrino portal. Journal of Cosmology and Astroparticle Physics, 2020 (030), 1-23, [JCAP03]. (doi:10.1088/1475-7516/2020/03/030).

Record type: Article

Abstract

We propose a minimal seesaw extension to simultaneously account for realistic neutrino mass and mixing, the baryon asymmetry of the Universe via leptogenesis and a viable dark matter relic density, in which two right-handed neutrinos are coupled to a dark Dirac fermion and complex scalar field, both charged under a global U(1)D symmetry. As a concrete example, we consider the Littlest Seesaw model which describes neutrino mass and mixing and accounts for leptogenesis, thereby fixing the neutrino Yukawa couplings and right-handed neutrino masses. By considering the freeze-in production mechanism of dark matter, we explore the parameter space of right-handed neutrino portal couplings and dark particle masses which give the correct dark matter relic abundance, focussing on the case of a superheavy Dirac fermion dark matter particle, with a mass around 1010 GeV . Such a FIMPzilla can provide a successful explanation of the dark matter relic abundance, with its production reliant on neutrino Yukawa couplings over much of the parameter space, depending on the assumed dark particle masses, and the reheat temperature.

Text
Minimal seesaw extension for neutrino mass and mixing, leptogenesis and dark matter FIMPzillas through the right-handed neutrino portal - Accepted Manuscript
Restricted to Repository staff only until 11 March 2021.
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More information

Accepted/In Press date: 21 February 2020
e-pub ahead of print date: 12 March 2020
Published date: March 2020

Identifiers

Local EPrints ID: 441017
URI: http://eprints.soton.ac.uk/id/eprint/441017
ISSN: 1475-7516
PURE UUID: a035863e-f23f-425d-950d-586572f0d376

Catalogue record

Date deposited: 27 May 2020 16:55
Last modified: 02 Mar 2021 17:34

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